A data storage method and apparatus, where the method includes obtaining a primary index of a data object, where a row identifier of the primary index includes at least one field, determining a row identifier of a secondary index of the data object, where the row identifier of the secondary index includes an index field and a field other than the index field in the at least one field of the row identifier of the primary index, and the index field is different from the first field in the at least one field of the row identifier of the primary index, generating the secondary index of the data object according to the row identifier of the secondary index, and storing the data object according to the primary index and the secondary index, thereby saving storage space.